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This was inspired by the "reverse" question . Is there any switch, protection element, (even a new breaker box) which is not allowed to be installed downstream of a GFCI?

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    What do you mean by "a GFCI"? That's like "a blue". There's a noun missing. A GFCI recep? GFCI breaker? GFCI deadfront? GFCI combo device? GFCI device (globally: of any kind)? – Harper - Reinstate Monica Jul 30 '20 at 19:02
  • Also, are you caring only about things that'd turn up in an average single family dwelling, or do you want to hear about the exotics as well? – ThreePhaseEel Jul 30 '20 at 23:46
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The only restriction would be in a “smart switch” that doesn't have a neutral but uses the ground for a small amount of current I think these are limited to 5 but I would have to check on that to verify the number.

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